20
19 14 20 15 18 16 11 17 12 13 
12 13 20 11 18 17 14 16 19 15 
17 18 19 16 15 20 13 11 12 14 
16 18 17 14 12 11 13 20 15 19 
15 11 19 14 17 16 13 12 20 18 
12 14 20 11 18 16 15 17 19 13 
18 14 12 11 15 16 20 19 17 13 
20 18 17 14 11 12 19 13 16 15 
17 13 11 19 18 12 15 20 14 16 
12 14 19 13 18 15 16 11 20 17 
3 6 4 10 5 9 1 8 7 2 
8 10 5 9 6 1 2 4 3 7 
8 1 2 9 6 3 7 10 5 4 
2 4 7 5 9 6 3 10 8 1 
1 10 6 7 8 5 4 3 9 2 
4 6 7 8 5 10 2 1 3 9 
8 6 3 5 7 9 2 10 4 1 
6 7 3 2 9 5 4 8 10 1 
6 8 2 7 3 1 10 9 5 4 
1 9 8 4 3 7 6 5 10 2 
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forbidden 1 19
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forbidden 3 12
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forbidden 9 12
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forbidden 10 20